<h4 class="mb-3">1.通过<code>label</code>属性：</h4>
<ti-formfield>
  <ti-item [label]="labelName">
    <input type="text" tiText [(ngModel)]="inputValue" clearable />
  </ti-item>
</ti-formfield>
<button tiButton class="my-3" type="button" color="primary" (click)="clickHandle()">改变 Label 内容</button>
<h4 class="my-3">2.通过 ti-item-label：</h4>
<ti-formfield>
  <ti-item>
    <ti-item-label>
      <div>
        <em style="color: red">自定义</em>
        <span style="color: blue">结构:</span>
      </div>
    </ti-item-label>
    <input type="text" tiText [(ngModel)]="customInputValue" clearable />
  </ti-item>
</ti-formfield>
<h4 class="my-3">3.Label 宽度：</h4>
<ti-formfield [labelWidth]="labelWidth">
  <ti-item [label]="'自定义 Label 宽度：'">
    <input type="text" tiText [(ngModel)]="labelWidthInputValue" clearable />
  </ti-item>
</ti-formfield>
